I've been looking at a few compasses, and was wandering if something like the Suunto M-9 wrist compass will do, or if something like the Brunton 16DLU mirror sighting compass is recommended instead. When would you use one over the other? Would a basic baseplate compass, say the Silva Explorer 203 work? I guess what I'm asking is what are the features to look for? Do I need a scale and/or sight when it comes to compasses?

Please.. don't refer to GPS. ;o)